Testicular pain is just a symptom, there are many causes of testicular pain, common causes include orchitis, epididymitis, testicular torsion, varicocele, testicular sheath effusion, testicular cancer, trauma, etc., according to the degree of testicular pain, duration, and different accompanying symptoms can be initially identified. The most common cause of testicular pain is orchitis or epididymitis, in which case most of the symptoms of testicular pain are gradually worsening testicular swelling pain, often accompanied by redness and swelling of the scrotal skin, and most of the previous history of urethritis, acute bacterial prostatitis, mumps and other diseases. Most of the cases can be clearly diagnosed by ultrasound and physical examination. Testicular torsion is also a cause of testicular pain, which is a severe pain in the testicle that appears suddenly without any causative factors, often accompanied by testicular elevation, and ultrasound examination reveals that the blood flow in the testicle is decreased or even disappeared, which requires timely surgical or manipulative reset. In addition, testicular sheath effusion, varicocele, testicular cancer and so on can also cause testicular pain, these conditions mostly cause testicular swelling pain, the pain will appear for a longer time. To summarize, there are many causes of testicular pain, common causes include orchitis, epididymitis, testicular torsion, varicocele, testicular sheath effusion, testicular cancer, trauma, etc., which need to be clearly diagnosed after detailed medical history, physical examination and relevant auxiliary examination.